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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications $ 194.3 $ (1,167.3) $ (159.3)
Reclassifications out of AOCI 82.9 142.5 (14.7)
Tax effect (64.1) 248.3 42.0
Total other comprehensive income (loss), net of tax 213.1 (776.5) (132.0)
Unrealized Gains (Losses) on Debt Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications 181.4 (1,181.4) (168.8)
Reclassifications out of AOCI 80.9 136.5 (20.2)
Tax effect (64.3) 264.0 46.5
Total other comprehensive income (loss), net of tax 198.0 (780.9) (142.5)
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications 17.7 (43.3) (1.9)
Reclassifications out of AOCI 0.0 0.0 0.0
Tax effect (0.5) 1.1 0.0
Total other comprehensive income (loss), net of tax 17.2 (42.2) (1.9)
Pension Benefit Adjustment      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications (4.8) 57.4 11.4
Reclassifications out of AOCI [1] 2.0 6.0 5.5
Tax effect 0.7 (16.8) (4.5)
Total other comprehensive income (loss), net of tax $ (2.1) $ 46.6 $ 12.4
[1] Amounts are components of net periodic cost. See Note 16 Employee Benefit Plans for additional details.